Research the causes of related medical symptoms such as: 1  Eye. 2  Eye symptoms (5412 causes) 3  Eye disease. 4  Eye disorder. 5  Eye problem (5412 causes) 6  Eye pain (475 causes) 7  Itch (1068 causes) 8  more symptoms...Â».
How to read the Histogram. A histogram is a graphical representation of the pixels exposed in your image. The left side of the graph represents the blacks or shadows, the right side represents the highlights or bright areas and the middle section is mid-tones (middle or 18% grey).
Depending on the image you're viewing on your screen, your histogram may look similar to mine or it may look completely different, and that's okay. Every image will have its own unique histogram, and you'll understand why that is in a few moments: The histogram in the center of the Levels dialog box.epending on the image you're viewing on your screen, your histogram may look similar to mine or it may look completely different, and that's okay. Every image will have its own unique histogram, and you'll understand why that is in a few moments: The histogram in the center of the Levels dialog box.